[issue18530] posixpath.ismount performs extra lstat calls

[Christian Heimes]

Christian Heimes added the comment:

LGTM

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nosy: +christian.heimes
stage:  -> patch review
type:  -> resource usage
versions: +Python 3.3, Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18530>
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